metallicafan wrote:

Hi,

Has someone studied the Rates chapter of the Manhattan Guide?, Is it useful?

I have read it very fast and I think that makes this topic complicated, while it is very simple.

I think that it is just important to know some basic formulas. Period. However, they use charts that I have never used in my life!

Please, give me your feedback to confirm whether I should study or skip it.

Thank you!

You need to know only two things to solve any rates problem:

1. Rates are additive (not time) - e.g. if A's speed is 1/2 work per hr and B's speed is 1/3 work per hr, together they do (1/2 + 1/3) work per hr.

Instead if we know that A does the work in 2 hrs and B does it in 3 hrs, they DO NOT take 5 hrs together! (obviously!)

2. Work = Rate*Time

If they do 1 work, then Rate is inverse of time (Say if A takes 3 hrs to complete a work, his rate is 1/3)

If they are working together, use their combined rate in the formula (since you can add rates)

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